1998839808 has 224 divisors, whose sum is σ = 6773387520. Its totient is φ = 570654720.

The previous prime is 1998839803. The next prime is 1998839833. The reversal of 1998839808 is 8089388991.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998839803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1547643 + ... + 1548933.

Almost surely, 2^1998839808 is an apocalyptic number.

1998839808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998839808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3386693760).

1998839808 is an abundant number, since it is smaller than the sum of its proper divisors (4774547712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1998839808 is an equidigital number, since it uses as much as digits as its factorization.

1998839808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333 (or 1303 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 63.

The square root of 1998839808 is about 44708.3863273995. The cubic root of 1998839808 is about 1259.6773777173.

The spelling of 1998839808 in words is "one billion, nine hundred ninety-eight million, eight hundred thirty-nine thousand, eight hundred eight".